Scroll down approximately 4/5 of the page until you find the 3.1.3C split software:

To implement a local provisioning server, the following FTP walkthrough can be used. Of course, you do not need to upgrade the software but it might be useful to get the customer on 4.0.5C as the web interface capabilities are much improved. Otherwise, it can just be used as a repository for your configuration files. Attached is a file called MAC.cfg – just rename it with the MAC of the phones in question or use 000000000000.cfg if you have too many. The file contains the necessary parameter to force DTMF payload 101:

First create a new directory on the computer which will host the FTP server. This is the directory where we will later put the IP331 software.

Once installed start the Filezilla Server and then the Filezilla Interface from the Start menu. You should be presented with the following screen:

We can now create an account as follows:

Press the user account button:

This screen should appear:

Via the Add button create a new account – call it 335 (as this will be the software version we will try first). Make sure the password is left blank – there will be no password.

Now Click on Shared folders in the left hand menu:

Click on Add and select the directory you created earlier. Make sure you tick all the boxes under Files and Directories – it isn’t the most secure, but this is for internal use only and it will reduce the chance of any possible connection issues.

Place it in the directory you created earlier and unpack it, The files must be in the root of the directory and not a subfolder. If successful, you should see something like:

That should be it for the server. Please also ensure the Windows firewall is switched off or both the server and the interface programs have exceptions. Switching the firewall off entirely reduces the chances of connectivity problems.

Follow the steps below on the IP331 to point it to your FTP server. Interrupt the boot countdown, then:

In order to downgrade / upgrade unpack the downgrade/upgrade software into the same directory which already contains the target software. Point the phone to the directory as per the guide above and the phone should retrieve the new BootROM and proceed with the downgrade / upgrade.

Please note this website requires cookies in order to function correctly, however they do not store any specific information about you personally. Additionally we use Google Analytics to monitor site use and help us improve your experience. No personal data is shared in this process.